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Kernel: Make SlabAllocator fall back to kmalloc() when slabs run out

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This is obviously not ideal, and it would be better to teach it how to
allocate more pages, etc. But since the physical page allocator itself
currently uses SlabAllocator, it's a little bit tricky :^)
This commit is contained in:
Andreas Kling 2019-10-10 11:56:57 +02:00
parent ebacef36ee
commit a6e4c504e2
Notes: sideshowbarker 2024-07-19 11:44:22 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/a6e4c504e2a
1 changed files with 11 additions and 2 deletions
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13
Kernel/Heap/SlabAllocator.cpp
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@ -10,8 +10,9 @@ public:
void init(size_t size)
{
void* base = kmalloc_eternal(size);
FreeSlab* slabs = (FreeSlab*)base;
m_base = kmalloc_eternal(size);
m_end = (u8*)m_base + size;
FreeSlab* slabs = (FreeSlab*)m_base;
size_t slab_count = size / templated_slab_size;
for (size_t i = 1; i < slab_count; ++i) {
slabs[i].next = &slabs[i - 1];
@ -27,6 +28,8 @@ public:
void* alloc()
{
InterruptDisabler disabler;
if (!m_freelist)
return kmalloc(slab_size());
ASSERT(m_freelist);
void* ptr = m_freelist;
m_freelist = m_freelist->next;
@ -39,6 +42,10 @@ public:
{
InterruptDisabler disabler;
ASSERT(ptr);
if (ptr < m_base || ptr >= m_end) {
kfree(ptr);
return;
}
((FreeSlab*)ptr)->next = m_freelist;
m_freelist = (FreeSlab*)ptr;
++m_num_allocated;
@ -57,6 +64,8 @@ private:
FreeSlab* m_freelist { nullptr };
size_t m_num_allocated { 0 };
size_t m_num_free { 0 };
void* m_base { nullptr };
void* m_end { nullptr };
static_assert(sizeof(FreeSlab) == templated_slab_size);
};